Question

A compound containing 40.0% carbon, 5.7% hydrogen and 53.3% oxygen has an atomic mass of 175 g/mol. What is the molecular formula?

Answer 1

Answer:

Explanation:

You may get your answer from the picture attached .#see down..

Answer 2

The Empirical formula of the compound is $HCHO$ Formaldehyde

Explanation:

• Given $40$ % carbon, $5.7$ % hydrogen and $53.3$ % oxygen has an atomic mass of 175 g/mol.
• Assuming  $100 gm$  of the compound then Carbon is  $40$ gm

• Oxygen is   $6.7$gm
• Hydrogen  is $53.3$   gm
• Calculation of moles of each element
• Moles of Carbon $40$ gm C×$\frac{1 mole C}{12.01 C}$=$3.331 C$
• Moles of Hydrogen  $6.7$ gm H ×$\frac{1 mole H}{1.008 H}$=$6.65 H$
• Moles of Oxygen $53.3$ gm O ×$\frac{1 mole H}{16.00 O}$=$3.331 O$

• In order to get the ratio, we divide each number of moles by the smallest number.
• The ratio if C:H:O =1:2:1
• Thus the empirical formula $CH2O$ that is $HCHO$ Formaldehyde